Adjustable chair stand

Abstract

An adjustable chair stand including a stand having a socket at a top side thereof, a threaded stem inserted into the socket and secured thereto to support a seat at the desired elevation, a bushing mounted in the socket around the threaded stem and having an arched packing plate in a side opening thereof, a lock screw mounted on the socket and turned to press on the arched packing plate against the threaded stem, and a clamping device fastened to the threaded stem and supported on the socket to stop the threaded stem from linear movement, the clamping device including two hinged arched clamping plates, and a fastener adapted to fix the free ends of the hinged arched clamping plates together.

What the invention claimed is: 
     
       1. An adjustable chair stand comprising: a stand, said stand comprising a socket at a top side thereof, said socket having a top annular groove and a nut embedded in a transverse through hole thereof;   a threaded stem inserted into said socket of said stand and secured thereto to support a seat at the desired elevation;   a bushing mounted in said socket around said threaded stem, said bushing comprising a top flange supported on said top annular groove of said socket, a side opening, and an arched packing plate inserted in said side opening;   a lock screw threaded into said nut and pressed on said arched packing plate against said threaded stem; and   a clamping device fastened to said threaded stem and supported on said socket of said stand to stop said threaded stem from linear movement, said clamping device comprising two arched clamping plates hinged together, said arched clamping plates having a respective fixed end hinged together, a plurality of vertically spaced grooves at an inner side respectively forced into engagement with said threaded stem, and a respective free end made with a respective transverse through hole, and a fastener adapted to fix the free ends of said arched clamping plates together.